Nano Y <sub> 2 </ Sub> Sio <sub> 5 </ Sub>: Eu (3 +) Phosphor Preparation, Characterization And Microstructure Research

Y₂SiO₅:Eu³⁺ phosphor is an important rare earth compounds, and the bulk material has been used in the advanced technique field of raster display, illuminating lamps.With increasing research interests of nano-phosphor, it has been found that nano-phosphor doped with doped with RE³⁺ ions have many perfect properties which can complement the disadvantages of bulk materials. It has been reported that nanocrystalline Y₂SiO₅:Eu³⁺ has higher fluorescence intensity compared with bulk materials. However, relationships between the microcosmic structure and fluorescent properties have not been reported.In this paper, it is intended to research the relationships between the microcosmic structure of nanocrystalline Y₂SiO₅:Eu³⁺ and the optical properties. It is also discussed that many factors, such as, the kinds of doped ions, configuration of host materials and preparation techniques, have influences on the microcosmic structure of nano-materials. And it is hopeful to seek after theoretical basis for RE³⁺ doped nano-phosphors with perfect properties.Nanocrystalline Y₂SiO₅:Eu³⁺ has been prepared by the polymer-net gel process and the gel-combustion synthesis. The powder Y₂SiO₅ is the host and the Eu³⁺ ions are luminescence centers. The Gd³⁺ ions are chosen for sensitive activators and its influence on optical property of Y₂SiO₅:Eu³⁺ has been researched.The two chosen preparation techniques have been researched in detail. It has been found that some polymer-net reagents, such as PEG and PVA have effects on the final powder. The reagents and Y³⁺ ions can form irons gathers bond, and then form organic-net which restrict grains to grow bigger. It is found that many factors, such as, the ratio of the precursor, PH value, time of water bath and slating, temperature of oven and pre-calcination, have influences on the grain size of nanocrystalline Y₂SiO₅:Eu³⁺. Among them calcination technique is the most important effect which decides the good scattered nanocrystalline can be obtained or not and it is researched in detail. Nanocrystalline Y₂SiO₅:Eu³⁺ with different average grain sizes, such as, 25nm,40nm,84nm,103nm have been prepared by this technique and grain size affected factors has been analyzed. It is significative to prepare nanocrystalline with controllable grain size and research its microcosmic structure further.It is not reported that Y₂SiO₅:Eu³⁺ can be prepared by combustion synthesis heretofore. In this paper, influences of different factors, such as quantity of glycine, water of the precursor, ratio between silicon and yttrium, burning temperature and calcination temperature on the grain size of the nanocrystalline have been researched, it is discussed particularly that the quantity of have influences on the final outcome, especially the quantity of glycine and calcination temperature. The national...